linux-kernel - Re: [PATCH v2 04/11] gpiolib: provide gpio_device_find_by

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Message-ID: <CAMRc=Me0vzHjwVPMk99Orx2EZfM-OKiEZKC2Nzk6HQFz5P867A@mail.gmail.com>
Date:   Thu, 14 Sep 2023 21:55:34 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 04/11] gpiolib: provide gpio_device_find_by_label()

On Tue, Sep 12, 2023 at 12:57 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Tue, Sep 12, 2023 at 12:07:20PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > By far the most common way of looking up GPIO devices is using their
> > label. Provide a helpers for that to avoid every user implementing their
> > own matching function.
>
> ...
>
> > +static int gpio_chip_match_by_label(struct gpio_chip *gc, void *label)
> > +{
> > +     return gc->label && !strcmp(gc->label, label);
>
> When gc->label can be NULL?
>

Whenever the driver doesn't assign it. The copy in gpio_device is set
to "unknown" for display in logs/user-space but not the one in
gpio_chip.

Bart

> > +}
>
> --
> With Best Regards,
> Andy Shevchenko
>
>